The stay was great. What I liked the most:
1. Travelling tips - especially food (you need to visit Goethe food market - my favourite is egg noodle wonton soup, 4-5 stand on the left).
2. No problem with check-in. After you book your trip you will receive instructions how to get in. It is a simple game quest with all the instructions :-)
3. Location. The place is about 7-8 mins on foot from Lumphini MRT and 20 mins from Sala Daeng BTS, so you can get everywhere very fast. I was in December so I could walk without any problem - not so hot. If you want to go to places not near BTS/MRT/ARL just use Grab, as Evan suggest. For Example flat rate trip to Khao San is about 4.5 USD (after 9PM), just checked on my card.